url路由正则表达式PHP

Question

我正在编写一个处理PHP Web服务路由的类,但我需要更正正则表达式,我想知道什么是最有效的解析url的方法.

示例网址:

• POST /用户
• GET /用户
• GET/users&limit = 10&offset = 0
• GET/users/search&keyword = Richard
• GET/users/15/posts/38

我想在PHP中为类创建的是:

$router = new Router();
$router->addRoute('POST', '/users', function(){});
$router->addRoute('GET', '/users/:uid/posts/:pid', function($uid, $pid){});
$target = $router->doRouting();

目标变量现在包含一个数组:

• 方法
• 网址
• 回调方法

这是我到目前为止所得到的:

class Router{
    use Singleton;

    private $routes = [];
    private $routeCount = 0;

    public function addRoute($method, $url, $callback){
        $this->routes[] = ['method' => $method, 'url' => $url, 'callback' => $callback];
        $this->routeCount++;
    }

    public function doRouting(){
        $reqUrl = $_SERVER['REQUEST_URI'];
        $reqMet = $_SERVER['REQUEST_METHOD'];

        for($i = 0; $i < $this->routeCount; $i++){
            // Check if the url matches ...
            // Parse the arguments of the url ...
        }
    }
}

所以我首先需要一个正则表达式:

1. / mainAction /:argumentName/secondaryAction /:secondaryActionName

检查是否与$ reqUrl匹配(参见上面的for循环)

1. 提取参数,以便我们可以在回调函数中使用它们.

我自己尝试了什么:

(code should be in the for loop @ doRouting function)

// Extract arguments ...
$this->routing[$i]['url'] = str_replace(':arg', '.+', $this->routing[$i]['url']);

// Does the url matches the routing url?
if(preg_match('#^' . $this->routes[$i]['url'] . '$#', $reqUrl)){
    return $this->routes[$i];
}

我非常感谢所有的帮助,非常感谢.

Answer 1

这基本上现在有效.

public function doRouting(){
    // I used PATH_INFO instead of REQUEST_URI, because the 
    // application may not be in the root direcory
    // and we dont want stuff like ?var=value
    $reqUrl = $_SERVER['PATH_INFO'];
    $reqMet = $_SERVER['REQUEST_METHOD'];

    foreach($this->routes as  $route) {
        // convert urls like '/users/:uid/posts/:pid' to regular expression
        $pattern = "@^" . preg_replace('/\\\:[a-zA-Z0-9\_\-]+/', '([a-zA-Z0-9\-\_]+)', preg_quote($route['url'])) . "$@D";
        $matches = Array();
        // check if the current request matches the expression
        if($reqMet == $route['method'] && preg_match($pattern, $reqUrl, $matches)) {
            // remove the first match
            array_shift($matches);
            // call the callback with the matched positions as params
            return call_user_func_array($route['callback'], $matches);
        }
    }
}

PS:你不需要这个$routeCount属性